Apr 22, 2013 10:06 PM

Ive been finding this insect in my (first floor new build - 3yr old) flat over the last 3-4 weeks in increasing frequency...one here and there every week or few days to finding 4 on the same window today.

We have 2 indoor cats and rarely open our windows. I have found them in several different rooms around the flat but probably more nearer windows & the sills. Ive attached a pic (though you may need to zoom in a bit). Its hard to see but I think they have wings though ive not seen them fly.

Do I have an infestation? Is it something to worry about?

Thanks in advance for any info or even just a name I can research a bit more

Thanks for the quick reply Mike & BW. If i see another one soon ill try see if I can get it to fly to be sure.

Is there any where they could be nesting or coming from? Like I said, we open the windows sometimes but not often so that seems unlikely. Theres not really any consistency with where theyre showing up. Hmm..

The one in the pic is particularly big, at about 2 fingers width but we just found another one less than half its size and after blowing on it a bit, it wouldnt fly... will keep you posted

They would be interested in the larvae of solitary bees or wasps, which can nest in a variety of situations. Do you have any dry rotting wood (perhaps a corner of a window frame)? Solitary bees/wasps may make their own nest holes (by burrowing or building) or adopt existing ones. If the latter, many a dark opening could be of interest - rolled-up papers, gaping spines of books, etc.

we do have some mould at the corners of windows from condensation but its a very new build so rotting wood is probably not likely. Thanks though, Ill have a hunt for any other candidates. They have shown up near windows most often. About 60% of the sightings. Thanks